Let $C ( t )$ Be the Total Value of US Currency (Coins and Banknotes)

question 10

Short Answer

Let $C ( t )$ be the total value of US currency (coins and banknotes) in circulation at time. The table gives values of this function from 1980 to 2000 , as of September 30 , in billions of dollars. Estimate the value of $C ( 1990 )$ .
$\begin{array}{|l|l|l|l|l|l|}\hline \mathrm{t} & 1980 & 1985 & 1990 & 1995 & 2000 \\\hline \mathrm{C}(\mathrm{t}) & 129.9 & 176.3 & 275.9 & 405.3 & 568.6 \\\hline\end{array}$

Answers are in billions of dollars per year. Round your answer to two decimal places.

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